<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<input type="text" id="input1" />+
		<input type="text" id="input2" />
		<input type="button" value="=" onclick="add()" />
		<span id="resultSpan"></span>
		<script type="text/javascript">
			function add()
			{
				var input1=document.getElementById("input1")
				var num1= parseInt(input1.value)
				var input2=document.getElementById("input2")
				var num2= parseInt(input2.value)
				var num3=num1+num2
				var resultSpan=document.getElementById("resultSpan")
				resultSpan.innerHTML=num3
			
			}
			
			
		</script>
		
		
	</body>
</html>
